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Overview of Operating Modes and Basic Operation Teledyne API – Model T700 Dynamic Dilution Calibrator
98
4.1. STANDBY MODE
When the T700 Dynamic Dilution Calibrator is in standby mode, it is at rest. All
internal valves are closed except the diluent inlet valve. The mass flow controllers are
turned off. On units with O
3
generator and photometer options installed, these
subsystems are inactive.
The SETUP GAS submenu is only available when the instrument is in STANDBY
mode.
Some functions under the SETUP MORE DIAG submenu, those which conflict
with accurate creation of calibration gas mixtures (e.g. ANALOG OUTPUT STEP
TEST) automatically place the calibrator into STANDBY mode when activated.
The MFC pressures are not monitored in standby mode since the MFCs are turned
OFF. This prevents erroneous MASS FLOW WARNING messages from
appearing.
Note
The T700 calibrator should always be placed in STANDBY mode when not
needed to produce calibration gas. The last step of any calibration sequences
should always be the STANDY instruction.
Table 4-2 shows the status of the T700’s various pneumatic components when the
calibrator is in STANDBY mode.
Table 4-2: Status of Internal Pneumatics During STANDBY Mode
VALVES
(X = Closed; O = Open)
MFCs
CYL1 CYL2 CYL3 CYL4 PURGE DILUENT GPT
O
3
GEN
PHOT
M/R
1
CAL1 CAL2
1
DILUENT
PHOT
PUMP
X X X X X O X X
Reference
Phase
OFF OFF OFF OFF
1
Only present if multiple cal gas MFC option is installed.
In instruments with optional O
3
generators installed, airflow is maintained during
STANDBY mode so that the generator can continue to operate at its most efficient
temperature.
06873B DCN6388